PICK AND CHOOSE
A heavier arrow will flat-out penetrate better than a light one, but I don’t get hung up on specifics. Personally, I don’t use anything lighter than 550 grains—and 600-plus grains is better.
You won’t find arrows that heavy ready to go at your pro shop, so you’ll probably have to custom-build them to get the desired finished weight. Most standard carbon hunting arrows weigh 6 to 10 grains per inch, depending on style and spine. Opt for the heaviest you can get, and then look to your components for the finishing touches.
For standard-diameter shafts, I like Easton Brass HIT inserts over any sort of outsert. These have standard threading, and I recommend pairing them with a tough and heavy broadhead like the Cutthroat Single Bevel, Iron Will, or Valkyrie Archery Blood Eagle, some of which are available in weights of 250 grains.
Micro-diameter shafts are becoming popular as well. My favorite setup is the Gold Tip Kinetic Pierce Platinum with the Valkyrie Archery glue-on center pin adapter, topped with a Grizzly single-bevel broadhead.
The most recent grizzly bear I killed with this setup was a quartering-to shot with a 53-pound recurve. I hit him right through the shoulder, and the arrow zipped out the other side.